Revert "who is coming" list
Revert "who is coming" list

* Bring back the dynamic functionality of the who's coming list that we
temporarily removed for the 2019 Congress
* Add a check in the controller for an alternate yearly view of the list
so that 2019 can keep its static list and so that any future years can
use the same solution

usgo/gocongress,usgo/gocongress,usgo/gocongress,usgo/gocongress